Method and apparatus for simulation, and a computer product

Abstract

A simulator includes a model generation/management section that generates and manages a model corresponding to a system to be simulated; a scenario generation/management section that prepares a future-forecasting scenario for verifying a state that the system does not satisfy a predetermined performance standard in future, and at the same time, prepares a design-supporting scenario for verifying a state that the system satisfies the predetermined performance standard; a simulation engine that executes a simulation corresponding to the future-forecasting scenario or the design-supporting scenario; and a simulation control section that controls a simulation corresponding to the design-supporting scenario or the future-forecasting scenario based on a result of a simulation of the future-forecasting scenario or the design-supporting scenario.

What is claimed is:  
     
         1 . A simulator comprising: 
 a model preparation unit that prepares a model corresponding to a system to be simulated;    a future-forecasting scenario preparation unit that prepares a future-forecasting scenario for verifying a state that said system does not satisfy a predetermined performance standard in future, based on a result of executing a simulation of the model;    a design-supporting scenario preparation unit that prepares a design-supporting scenario for verifying a state that said system satisfies a performance standard, based on a result of executing a simulation of the model;    a simulation execution unit that executes a simulation corresponding to the future-forecasting scenario or the design-supporting scenario; and    a simulation control unit that makes said simulation execution unit execute a simulation corresponding to the design-supporting scenario or the future-forecasting scenario, based on a result of the simulation of the future-forecasting scenario or the design-supporting scenario.    
     
     
         2 . The simulator according to    claim 1   , wherein said simulation control unit controls the sequence of executing a simulation by utilizing a mutually dependent relationship between the future-forecasting scenario and the design-supporting scenario.  
     
     
         3 . The simulator according to    claim 1   , wherein said system includes a network to which many network devices are connected.  
     
     
         4 . The simulator according to    claim 3   , wherein said future-forecasting scenario preparation unit prepares the future-forecasting scenario by setting a topology and a service rate as constants and setting a qualitative arrival rate and a quantitative arrival rate as variables among parameters of said network and said network devices.  
     
     
         5 . The simulator according to    claim 3   , wherein said design-supporting scenario preparation unit prepares the design-supporting scenario by setting a qualitative arrival rate and a quantitative arrival rate as constants and setting a topology and a service rate as variables among parameters of said network and said network devices.  
     
     
         6 . The simulator according to    claim 2   , wherein said system includes a network to which many network devices are connected.  
     
     
         7 . The simulator according to    claim 6   , wherein said future-forecasting scenario preparation unit prepares the future-forecasting scenario by setting a topology and a service rate as constants and setting a qualitative arrival rate and a quantitative arrival rate as variables among parameters of said network and said network devices.  
     
     
         8 . The simulator according to    claim 6   , wherein said design-supporting scenario preparation unit prepares the design-supporting scenario by setting a qualitative arrival rate and a quantitative arrival rate as constants and setting a topology and a service rate as variables among parameters of said network and said network devices.  
     
     
         9 . A simulation method comprising the steps of: 
 preparing a model corresponding to a system to be simulated;    preparing a future-forecasting scenario for verifying a state that said system does not satisfy a predetermined performance standard in future, based on a result of executing a simulation of the model;    preparing a design-supporting scenario for verifying a state that said system satisfies a performance standard, based on a result of executing a simulation of the model;    executing a simulation corresponding to the future-forecasting scenario or the design-supporting scenario; and    making a simulation corresponding to the design-supporting scenario or the future-forecasting scenario to be executed at the simulation execution step, based on a result of the simulation of the future-forecasting scenario or the design-supporting scenario.    
     
     
         10 . The simulation method according to    claim 9   , wherein at the simulation control step, the sequence of executing a simulation is controlled by utilizing a mutually dependent relationship between the future-forecasting scenario and the design-supporting scenario.  
     
     
         11 . The simulation method according to    claim 9   , wherein said system includes a network to which many network devices are connected.  
     
     
         12 . The simulation method according to    claim 10   , wherein said system includes a network to which many network devices are connected.  
     
     
         13 . A computer-readable recording medium which records a computer program that includes instruction which when executed on a computer causes the computer to perform the steps of: 
 preparing a model corresponding to a system to be simulated;    preparing a future-forecasting scenario for verifying a state that said system does not satisfy a predetermined performance standard in future, based on a result of executing a simulation of the model;    preparing a design-supporting scenario for verifying a state that said system satisfies a performance standard, based on a result of executing a simulation of the model;    executing a simulation corresponding to the future-forecasting scenario or the design-supporting scenario; and    making a simulation corresponding to the design-supporting scenario or the future-forecasting scenario to be executed at the simulation execution step, based on a result of the simulation of the future-forecasting scenario or the design-supporting scenario.    
     
     
         14 . A computer-readable recording medium which records a computer program that includes instruction which when executed on a computer causes the computer to perform the steps of: 
 preparing a model corresponding to a system to be simulated;    preparing a future-forecasting scenario for verifying a state that said system does not satisfy a predetermined performance standard in future, based on a result of executing a simulation of the model;    preparing a design-supporting scenario for verifying a state that said system satisfies a performance standard, based on a result of executing a simulation of the model;    executing a simulation corresponding to the future-forecasting scenario or the design-supporting scenario; and    making a simulation corresponding to the design-supporting scenario or the future-forecasting scenario to be executed at the simulation execution step, based on a result of the simulation of the future-forecasting scenario or the design-supporting scenario,    wherein at the simulation control step, the sequence of executing a simulation is controlled by utilizing a mutually dependent relationship between the future-forecasting scenario and the design-supporting scenario.    
     
     
         15 . A computer-readable recording medium which records a computer program that includes instruction which when executed on a computer causes the computer to perform the steps of: 
 preparing a model corresponding to a system to be simulated;    preparing a future-forecasting scenario for verifying a state that said system does not satisfy a predetermined performance standard in future, based on a result of executing a simulation of the model;    preparing a design-supporting scenario for verifying a state that said system satisfies a performance standard, based on a result of executing a simulation of the model;    executing a simulation corresponding to the future-forecasting scenario or the design-supporting scenario; and    making a simulation corresponding to the design-supporting scenario or the future-forecasting scenario to be executed at the simulation execution step, based on a result of the simulation of the future-forecasting scenario or the design-supporting scenario,    wherein said system includes a network to which many network devices are connected.    
     
     
         16 . A computer-readable recording medium which records a computer program that includes instruction which when executed on a computer causes the computer to perform the steps of: 
 preparing a model corresponding to a system to be simulated;    preparing a future-forecasting scenario for verifying a state that said system does not satisfy a predetermined performance standard in future, based on a result of executing a simulation of the model;    preparing a design-supporting scenario for verifying a state that said system satisfies a performance standard, based on a result of executing a simulation of the model;    executing a simulation corresponding to the future-forecasting scenario or the design-supporting scenario; and    making a simulation corresponding to the design-supporting scenario or the future-forecasting scenario to be executed at the simulation execution step, based on a result of the simulation of the future-forecasting scenario or the design-supporting scenario,    wherein at the simulation control step, the sequence of executing a simulation is controlled by utilizing a mutually dependent relationship between the future-forecasting scenario and the design-supporting scenario,    wherein said system includes a network to which many network devices are connected.